virtualbox.org

When I downloaded VirtualBox 5.0.14 to Windows 8.0workstation, I received an error stating that the checksum is invalid.

VirtualBox 4 was installed on the same machine before but I uninstalled it and I am trying to download VirtualBox 5 to install but the checksum error causes the download to terminate and delete the downloaded file.

I tried the download process many times with the same result.

The Exact message which I receive after the file is downloaded immediately is "The signature of VirtualBox is corrupt[t or invalid"

Check your Smart Screen settings. Microsoft doesn't allow SHA-1 signed downloads.

This file was downloaded before on the same machine, same OS and installed. When I tried to download the new version 5.0, I faced this problem. I tried to download version 4.3 but it fails as well with the same error message. I do not think that it is related to Windows settings

Well, you should think again.
viewtopic.php?f=6&t=75851&p=353251#p353251

I downloaded the file through Firefox, it gave me the same error but it has an option to install Anyway from Windows 8 screen.

Currently it is installed on my machine and it is working fine.